Question formation rules

In this lesson, you will learn how English question patterns change with be, auxiliary verbs, modal verbs, and question words.

1. What Is a Question?

A question is a sentence we use to:

• ask for information
• check something

English uses different patterns for questions with ordinary verbs, be, modal verbs, and question words that act as the subject.

2. Basic Rule for Questions in English

Choose the pattern according to the verb and the type of question:

Situation	Basic pattern	Example
present/past simple	do/does/did + subject + base verb	Does she work here?
information question with an ordinary verb	question word/phrase + do/does/did + subject + base verb	Where do you live?
be	am/is/are + subject	Are you ready?
past be	was/were + subject	Were you tired?
compound auxiliary	auxiliary + subject + verb form	Are you working? / Have you finished?
modal verb	modal + subject + base verb	Can you help?
subject question	question word + verb	Who called?

3. Yes / No Questions with DO and DOES

Use do and does to form questions in the present simple.

Use do with:

• I / you / we / they

Use does with:

• he / she / it

Structure

• Do / Does + subject + base verb?

Examples

• Do you work on Saturdays?
• Do they live near here?
• Does she like coffee?
• Does he play football?

Important Rule

• The main verb is always in the base form.
• ✗ Does she likes coffee?
• ✓ Does she like coffee?

4. Yes / No Questions with BE (present and past)

When the main verb is be, we do not use do or does.

Structure

• Am / Is / Are / Was / Were + subject?

Examples

• Are you tired?
• Is she at home?
• Are they ready?
• Was she at home yesterday?
• Were they late?

5. Yes / No Questions in the Past Simple (DID)

Use did for all subjects in past simple questions.

Structure

• Did + subject + base verb?

Examples

• Did you watch the movie?
• Did she call you yesterday?
• Did they arrive on time?

Important Rule

• All verbs in past simple questions use the base form after "did".
• ✗ Did you watched the movie?
• ✓ Did you watch the movie?

6. Questions with Modal Verbs

Modal verbs include:

• can, could, will, should, must

Structure

• Modal + subject + base verb?

Examples

• Can you help me?
• Should we leave now?
• Will she call later?

7. Information Questions with DO, DOES, and DID

When a question word asks about the object, place, time, reason, or manner, use do/does/did with an ordinary verb.

Common question words include what, where, when, why, who, which, whose, and how.

Structure

question word or phrase + do/does/did + subject + base verb?

Examples

• What do you do?
• Where do you live?
• Why did she leave early?
• How does this machine work?

Common question-word combinations

Question phrase	Use	Example
How much...?	price or an uncountable amount	How much does it cost? / How much water do you need?
How many...?	a number with a plural countable noun	How many students are in the class?
What time...?	a clock time	What time does the film start?
What kind of...?	a type or category	What kind of music do you like?
Which...?	a choice from a limited group	Which bus does she take?
Whose...?	possession	Whose coat is this?

If the question already has be or a modal, move that verb before the subject instead of adding do/does/did: Where are you? / What can she do?

Questions with have

When have is the main verb (possession), use do/does: Do you have a car?

8. Negative questions

Negative questions often show surprise, check an expectation, or invite someone to agree.

Use a contracted negative auxiliary before the subject:

negative auxiliary + subject + main verb/complement?

• Don’t you like coffee? (The speaker thought you liked it.)
• Isn’t she coming with us? (The speaker expected her to come.)
• Didn’t they call you yesterday? (The speaker is surprised or checking.)
• Can’t he swim? (The speaker thought he could.)

9. Subject and Object Questions

When the question word is the person or thing that performs the action (subject), do not use do/does/did.

Compare: Who called you? (who = subject, no do/does/did) and Who did you call? (who = object, use did). The same contrast applies to what: What happened? / What did you buy?

These are called subject questions and object questions.

Examples

• Who called you? / Who did you call?
• What happened? / What did you buy?
• Who lives here?

Preposition Placement in Object Questions

In everyday English, a preposition often stays at the end of an object question.

• Who did you go with?
• What are you looking for?
• Which team does she play for?

10. Question tags

A question tag is a short question added to a statement to check information or ask for agreement.

• It’s cold, isn’t it?
• You like coffee, don’t you?
• They didn’t call, did they?

The tag normally repeats the statement’s auxiliary, modal, or form of be. If a present or past simple statement has no auxiliary, use do/does/did. The tag usually changes from positive to negative, or from negative to positive.

11. Quick Decision Guide

1. Is the question word the subject? Use question word + verb. Example: Who called you?
2. Does the sentence already have be or a modal? Put it before the subject. Example: Are you ready? / Can she drive?
3. With an ordinary verb, add do, does, or did and keep the main verb in the base form. Example: Where does he work?
4. In a negative question, put the contracted negative auxiliary before the subject. Example: Didn’t they call you yesterday?
5. In everyday object questions, a preposition can stay at the end. Example: Who did you go with?